quiz results sortable

app/controllers/admin/result_controller.rb

@@ -1,7 +1,8 @@
 # frozen_string_literal: true
 module Admin
   class ResultController < AdminController
-    #
+    helper_method :sort_column, :sort_direction
+
     # TODO: change context from Candidate to Quiz
     # bypass pundit lockdowns until completed
     after_action :skip_policy_scope
@@ -12,7 +13,7 @@ module Admin
     def index
       @candidates = Candidate.where(completed: true)
                              .includes(:recruiter)
-                             .order(:review_status, completed_at: :desc)
+                             .order("#{sort_column} #{sort_direction}")
     end
 
     def view
@@ -22,5 +23,15 @@ module Admin
       @comments = QuizComment.includes(:user).where(test_hash: @candidate.test_hash).order(:created_at)
       @comment = QuizComment.new
     end
+
+    private
+
+      def sort_column
+        Candidate.column_names.include?(params[:sort]) ? params[:sort] : 'completed_at'
+      end
+
+      def sort_direction
+        %w(asc desc).include?(params[:direction]) ? params[:direction] : 'desc'
+      end
   end
 end